| | 1 | Author
| Juan Murgich, Yosslen Aray, Edgar Ospina, Rico, Ismardo Bonalde | Requires cookie* | | | Title
| N NQR in 1,10-Phenanthroline and Dicyano bis(l,10-phenanthroline)iron(III)  | | | | Abstract
| 14 N NQR spectra of 1,10-phenanthroline and of dicyano bis(l,10-phenanthroline)iron(lll) were obtained at room temperature. An analysis based on the shifts of the NQR frequencies and in the topology of the charge distribution in a model (pyridine) showed that the complex formation produces a strong decrease in the N valence shell nonbonded maximum and an increase in the bonded density along each of the N-H bond directions. The NQR spectrum showed that the complex formation produces only small changes in the charge distribution of the cyanide groups. | | | |
Reference
| Z. Naturforsch. 47a, 96—98 (1992); received August 3 1991 | | | |
Published
| 1992 | | | |
Keywords
| 14 N NQR, Phenanthroline, Complex, Charge distribution, Topology | | | |
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| default:Reihe_A/47/ZNA-1992-47a-0096.pdf | | | | Identifier
| ZNA-1992-47a-0096 | | | | Volume
| 47 | |
| 2 | Author
| Juan Murgich, Yosslen Aray, EdgarOspina Rico | Requires cookie* | | | Title
| N NQR and the Molecular Charge Topology in Coordinated Ammonia | | | | Abstract
| 14 N NQR spectra of [Co(NH3)6] • 3C1, [Co(NH3)5C03] • N03, [Zn(NH3)4] • 2C1, [Zn(NH3)4] • (BF4)2, and [Ag(NH3)4] • N03 were obtained at 77 K. The results, analyzed by means of the topology of the charge distribution obtained from ab-initio MO calculations of free and of a model of coordinated NH3, showed that bonding to the metal-ion produces a strong decrease (Co^>Zn %Ag) in the N nonbonded density ("lone pair") and an increase in the bonded maxima found in the N-H bond direction of the N valence shell. | | | |
Reference
| Z. Naturforsch. 47a, 217—220 (1992); received August 3 1991 | | | |
Published
| 1992 | | | |
Keywords
| 14 N NQR, Ammonia, Complex, Charge distribution, Topology | | | |
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| default:Reihe_A/47/ZNA-1992-47a-0217.pdf | | | | Identifier
| ZNA-1992-47a-0217 | | | | Volume
| 47 | |
| 3 | Author
| Ya-Nan Zhao, Sundara Ramaprabhu, EdwinA C Lücken | Requires cookie* | | | Title
| An NQR Study of Inclusion Compounds Formed Between Small Chlorine-containing Molecules and Ä/s(N-alkylimidazolidine-2-thione)Cu(I) Halide Complexes | | | | Abstract
| Twenty-five inclusion complexes formed by fe(N-alkyiimidazolidine-2-thione)cuprous halides with the small, chlorine-containing guest molecules CC1 4 , CHC1 3 , CH 2 C1 2 , CH 3 CC1 3 or C 2 H 2 C1 2 , have been prepared. Their 63 Cu and 35 C1 NQR spectra have been measured over the temperature range 77-300 K. For the corresponding bromides the 79 Br and/or 81 Br spectra have also been investigated. The studies reveal the number and symmetry of different inclusion site. The onset of rapid reorientation of the guest molecules is indicated by the fading out of their NQR signals between 77 and 300 K, whereas the resonances from the host molecules usually persist throughout this temperature range. However, as evidenced by discontinuities in the temperature-dependence of the NQR frequencies of the hosts, sixteen of the complexes show one or more phase-changes in this temperature-range. | | | |
Reference
| Z. Naturforsch. 51a, 677—685 (1996); received December 12 1995 | | | |
Published
| 1996 | | | |
Keywords
| NQR, Copper(I), Guest, Inclusion, Complex | | | |
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| default:Reihe_A/51/ZNA-1996-51a-0677.pdf | | | | Identifier
| ZNA-1996-51a-0677 | | | | Volume
| 51 | |
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